What are the possible values for the source argument of a Terraform module block?

Question

What are the possible values for the declaration of the `source` argument of a Terraform `module` block?

```
module "example" {
  source = ____
}

Accepted Answer

A directory next to the current directory: `../sub-directory`.

Accepted Answer

A directory in absolute definition: `/tmp/my-directory`.

Accepted Answer

A subdirectory of the current directory: `./sub-directory`.

Answer

A subdirectory of the current directory: `sub-directory`.

Question from the Terraform : certification training test